After thirty years as a sewer worker, Jim's record was acknowledged by a visit from the town's mayor who wanted to see for himself the valuable service that Jim performed. So the mayor climbed down into the sewer and asked Jim why he liked his job so much. "Well," said Jim, "my job is fascinating. You see that big poop floating past us now? That's from the carpenter. I can tell because you can see sawdust in it. Now this next poop, that's from the gardener. I can tell because it's got grass clippings in it. And this big poop coming into view now is from my wife." The mayor was amazed. "Jim, I can understand the logic behind the carpenter and the gardener, but how on earth do you know that that poop out of all the millions of poops in the sewer is from your wife?" "Easy," said Jim. "It's got my lunch tied to it."